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| | | import java.io.ObjectOutputStream;
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| | | import java.io.PipedInputStream;
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| | | import java.io.PipedOutputStream;
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| | | import java.math.BigInteger;
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| | | import java.security.MessageDigest;
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| | | import java.security.NoSuchAlgorithmException;
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| | |
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| | | public class DeepCopier {
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| | |
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| | | /**
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| | | * Utility method to calculate the checksum of an object.
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| | | * @param sourceObject The object from which to establish the checksum.
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| | | * @return The checksum
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| | | * @throws IOException
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| | | */
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| | | public static BigInteger checksum(Object sourceObject) {
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| | |
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| | | if (sourceObject == null) {
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| | | return BigInteger.ZERO;
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| | | }
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| | |
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| | | try {
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| | | ByteArrayOutputStream baos = new ByteArrayOutputStream();
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| | | ObjectOutputStream oos = new ObjectOutputStream(baos);
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| | | oos.writeObject(sourceObject);
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| | | oos.close();
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| | |
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| | | MessageDigest m = MessageDigest.getInstance("SHA-1");
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| | | m.update(baos.toByteArray());
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| | | return new BigInteger(1, m.digest());
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| | | } catch (IOException e) {
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| | | throw new RuntimeException(e);
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| | | } catch (NoSuchAlgorithmException e) {
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| | | // impossible
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| | | }
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| | |
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| | | return BigInteger.ZERO;
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| | | }
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| | |
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| | | /**
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| | | * Produce a deep copy of the given object. Serializes the entire object to
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| | | * a byte array in memory. Recommended for relatively small objects.
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| | | */
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